JP2003083394A - Rolling bearing type base isolation member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and safe operative base isolation member of rolling bearing type in which stable guiding for a steel ball is achieved and additionally a rolling surface of the steel ball is made comparatively small, and in which damping and restoring operations of the steel ball are provided by cooperation of its peripheral laminated rubbers and the like. SOLUTION: In a bearing type base isolation member, which has a steel ball 10 as a rolling bearing material disposed between respective center portions of a lower steel ball raceway board 6 attached to a lower structure side and an upper steel ball raceway board 9 attached to an upper structure side of lower and upper structures, the rolling bearing type of base isolation member is designed so that the laminated rubbers 7, 7, etc., are erected between upper and lower flange steel plates 4, 2 in four outside corners of steel ball stoppers 11 formed on the upper and lower steel ball raceway boards, center ends of the laminated rubbers 7 are connected to a guide steel plate 13, and the steel ball is held by a guide hole 15 formed in the center of the guide steel plate for holding a center position in a lateral direction of the steel ball and by position holes 17, 16 formed in the center of the upper and lower steel ball raceway boards for serving as a trigger.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing type seismic isolation member which is interposed between an upper structure such as a building frame, a product case, an exhibition stand and a lower structure such as a foundation member. .

[0002]

2. Description of the Related Art A conventional rolling bearing seismic isolation member of this type is a lower ball washer mounted on a flange steel plate 101 on the lower structure side between a lower structure and an upper structure as shown in FIG. 102 and flange steel plate 1 on the superstructure side
The steel balls 105, which are rolling bearings, are arranged between the respective central portions of the upper steel ball washer 104 attached to the No. 03, and the steel balls 105 are formed on the upper and lower steel ball washer 104, 102, respectively. Dish-shaped rolling surface 107,1 with a depressed center
There is one that can roll along 06 (hereinafter,
The former). Reference numeral 108 denotes a curing curtain provided on the outer circumference of the steel ball bearing washer 104, 102 at the upper and lower portions.

Further, between the lower structure and the upper structure as shown in FIG. 8, a steel ball washer 112 mounted on the flange steel plate 111 on the lower structure side and a bearing mounted on the flange steel plate 113 on the upper structure side. 114 steel balls 115
Is arranged so that the steel balls 115 can roll along a plate-shaped rolling surface 116 having a depressed central portion formed on the steel ball washer 112 (hereinafter referred to as the latter). Reference numeral 117 is a ball arranged in the bearing 114, and 118 is a base space for joining on the upper structure side.
It is a curing curtain provided on the outer periphery of the girder 113 and the steel ball washer 112.

[0004]

By the way, in the former case of the conventional example, the rolling bearing seismic isolation member is formed by the steel ball 105 as the rolling bearing material and the upper and lower steel ball bearing plates 104, 102, Although it functions as a support material and a restoration material, it has no damping function to absorb seismic energy, and the damping action is left to a separate damping material.
Since the steel ball 105 is in an unprotected state in which it is simply sandwiched between the upper and lower steel ball bearing plates 104 and 102, the position where the steel ball 105 is placed lacks stability, and accurate movement of the steel ball 105 cannot be expected. There's a problem.

On the other hand, in the latter case of the conventional example, the steel ball 11
Since the upper part of 5 is rotatably attached and held to the bearing 114, the position where the steel ball 115 is arranged is stable, but the rolling surface 116 of the steel ball 115 is only on the steel ball washer 112 arranged at the lower part. Since the rolling surface 116 must be formed, the area of the rolling surface 116 needs to be about four times as large as that of the former type in which the steel balls are rolling in the upper and lower steel ball washer. . Therefore, the curing curtain 118 for curing the steel ball washer 112 which is about four times as large as the former must also be equipped so as not to hinder the movement of the steel balls 115, and the overall scale becomes large and small scale. It is extremely unsuitable as a seismic isolation member for buildings.

The present invention has been made in view of such problems, and an object thereof is to stably guide a steel ball while making the rolling surface of the steel ball relatively small. And, it is attenuated by the cooperation with the surrounding laminated rubber,
An object of the present invention is to provide a rolling support type seismic isolation member that is safe in operation and has a compact size for performing a restoring operation.

Another object of the present invention is to provide a rolling bearing type seismic isolation member which is easily applied to a small-scale building.

Another object of the present invention is to provide a rolling bearing type seismic isolation member which can be easily assembled and disassembled.

Another object of the present invention is to provide a rolling bearing type seismic isolation member capable of performing reliable and sufficient damping operation.

[0010]

In order to achieve the above object, a rolling bearing seismic isolation member according to the present invention comprises a lower spherical washer and an upper portion which are attached to the lower structure side between the lower structure and the upper structure. In a bearing-based seismic isolation member in which steel balls, which are rolling bearings, are placed between the center parts of the upper ball washer mounted on the structure side, the steel balls formed on the upper and lower steel ball washer are prevented from rolling. A laminated rubber is erected between the upper and lower flanged steel plates at the four outer corners of the guide, the central end of each laminated rubber is connected to a guide steel plate, and a guide wheel for holding the horizontal center position of the steel ball at the center of the guide steel plate. Characterized by forming a hole and holding the steel ball by a position hole that plays a role of a trigger formed at the center of each of the upper and lower steel ball washer and the guide hole. Is.

Further, the steel ball is divided into an odd number of serial stages.

Further, the lower flange steel plate to which the lower steel ball washer is connected is on the lower structure side, the upper flange steel plate to which the upper steel ball washer is connected is on the upper structure side, and the upper end of each laminated rubber is the upper flange steel plate. In addition, the lower end of each laminated rubber is joined to the lower flange steel plate, and the central end of each laminated rubber is joined to the guide steel plate by bolts.

Also, a cylinder, a piston that slides on the inner surface of the cylinder, a valve formed in a trumpet shape on the lower surface of the piston, and a fluid moving hole that penetrates the piston and the valve. , And a fluid damper provided with, is provided between the lower structure side and the upper structure side.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the accompanying drawings. 1 and 2 show a first embodiment of the present invention. In FIGS. 1 and 2, 1 is a base plate for joining with a lower structure (not shown). A lower flange steel plate 2 is attached to 1. Reference numeral 3 is a base space for joining with an upper structure (not shown).
And the upper flange steel plate 4 on the base plate 3
Is attached.

On the lower flange steel plate 2, a lower steel ball bearing washer 6 with a mat rubber 5 interposed and one end of each of laminated rubbers 7, 7, ... Which are damping / restoring materials are attached. Further, on the upper flange steel plate 4, an upper steel ball bearing washer 9 via a mat rubber 8 and the other ends of the laminated rubbers 7, 7, ... Are attached.

A steel ball 10 is provided on the outer periphery of the lower steel ball washer 6.
Of the steel balls 10 are formed on the outer circumference of the upper steel ball washer 9 as well.

The laminated rubbers 7, 7 ...
9 are provided upright between the upper and lower flange steel plates 2 and 4 at four corners on the outer sides of the rolling stoppers 11 and 12, and a mounting flange 14 to the guide steel plate 13 is formed at the center end of each laminated rubber 7. The center end of each laminated rubber 7 is connected to the guide steel plate 13 by the flanges 14, 14.

At the center of the guide steel plate 13, a guide hole 15 for holding the horizontal center position of the steel ball 10 is provided.
Are formed. In addition, at the center of the steel ball washer 6 and 9, there is a position hole 1 which plays a role of a trigger.
6, 17 are formed. Therefore, the steel ball 10 arranged between the steel ball bearing washer 6 and 9 has the above position hole.
It is held by the rollers 16 and 17 and the guide wheel 15.

A space between the outer circumferences of the upper and lower flange steel plates 4 and 2 is covered with a curing screen 18, and a space for seismic energy absorption is provided between the upper and lower base plates 3 and 1. A damper (not shown) can be attached.

In the rolling bearing seismic isolation member having the above-described structure, when the wind pressure or seismic intensity is small (for example, seismic intensity 3 or less) during normal times, for example, the wind speed is about 30 m / s, the steel ball 10 is in the position ho -It is stably accommodated in the rollers 16 and 17, supporting the upper structure and suppressing the horizontal movement of the peripheral rubber layers 7, 7. When the seismic intensity increases (for example, seismic intensity of 3 or more), the steel ball 10 moves out of the position holes 16 and 17 to allow horizontal displacement of the laminated rubber layers 7, 7, ... The upper structure is supported.

When the seismic vibration is terminated, the restoring force of each laminated rubber 7 causes all the laminated rubbers 7, 7, ... To return to the substantially original state, and the steel ball 10 returns to the position holes 16 and 17 for rolling support. The seismic isolation system is completely restored to its original condition.

As described above, in the rolling bearing type seismic isolation member including the laminated rubbers 7 divided around the steel ball 10, the divided laminated rubbers 7, 7 ... The laminated rubbers 7 and the steel balls 10 cooperate with each other to withstand a large horizontal deformation that sometimes occurs, and can sufficiently withstand the eccentric pressure.

In the rolling bearing type seismic isolation member according to the present invention, the rolling surface of the steel ball 10 is arranged vertically to form a relatively small rolling surface, and the steel ball 10 is stably guided by the guide steel plate 13. Let it be done, and laminated rubber 7,7 around it
Damping and restoring operations are performed in cooperation with…, resulting in a safe and compact rolling bearing seismic isolation member.

FIGS. 3 to 5 show a second embodiment of the present invention. The first embodiment is different from the first embodiment in that steel balls are arranged between upper and lower steel ball raceways and a storage of the steel balls. Since there are differences and the rest of the configuration is substantially the same, the same reference numerals are given to the same parts in the drawings, and the description thereof will be omitted.

In this embodiment, the steel balls 30, 31,
32 are arranged in series in the vertical direction between the upper and lower steel ball bearing washer 6 and 9 in three stages.
The steel balls 1 and 32 are housed in a steel ball storage steel pipe 33, and the steel ball storage steel pipe 33 is fitted in a guide hole 15 of a guide steel plate 13. The steel balls are not necessarily divided into three stages, but may be odd stages such as five stages.

Then, the steel balls 30, 3 in this embodiment
1, 32 are steel balls 10 in the first embodiment as a whole.
The operation of the rolling bearing type base isolation member when the seismic intensity becomes large is as shown in FIG. 5, and the description thereof will be omitted.

In the drawing of this embodiment, as an example, a seismic energy absorbing fluid damper 34 is erected between the upper and lower base plates 3 and 1 via mounting plates 35 and 36. It is clearly indicated that

As described above, when the steel balls arranged between the upper and lower steel ball washer 9 and 6 are arranged in an odd number of stages such as 3 or 5 steps, both steel ball washer 6 , Steel balls with a relatively small diameter are used for the space between 9 and 9, which makes it possible to reduce the size of the rolling bearing seismic isolation member and to easily apply it to small-scale buildings. It will be a seismic isolation member.

Next, the upper and lower parts of the steel ball washer 9 and 6 are connected to the upper structure side and the lower structure side, and the upper and lower flange steel plates of the laminated rubber 7 erected between the upper and lower flange steel plates 4 and 2. An example of the means for connecting to Nos. 4 and 2 and for connecting the central end of the laminated rubber 7 to the guide steel plate 13 will be described in detail.

Reference numeral 41 is a plurality of bolts for connecting and connecting the upper steel ball bearing washer 9 and the upper flange steel plate 4 to the base plate 3 on the upper structure side, and 42 is the lower steel ball bearing washer 6 and A plurality of bolts connecting and connecting the lower flange steel plate 2 to the base plate 1 on the lower structure side, and 43 a plurality of bolts connecting and connecting the upper end of each laminated rubber 7 and the upper flange steel plate 4. , 44 are a plurality of bolts for connecting and connecting the lower end of each laminated rubber 7 and the lower flange steel plate 2,
Is the flange 14 formed at the center end of each laminated rubber 7.
And a plurality of bolts for connecting and connecting the guide steel plate 13 and the guide steel plate 13.

Thus, the lower steel ball washer 6 and the lower flange steel plate 2 are on the lower structure side, the upper steel ball washer 9 and the upper flange steel plate 4 are on the upper structure side, and the upper ends of the laminated rubbers 7 are The upper flange steel plate 4, the lower end of each laminated rubber 7 is the lower flange steel plate 2, and the central end of each laminated rubber 7 is the guide steel plate 1.
When the bolts 41 to 45 are joined to 3, it is possible to assemble the above-mentioned members on-site, and disassemble and carry them for inspection and maintenance, which facilitates work under a narrow floor. Will be things.

FIG. 6 is a sectional view of a fluid system damper 51 suitable for being installed between the lower structure side and the upper structure side of the rolling bearing type seismic isolation member according to the present invention. The cylinder 53 is provided with a piston 53 that slides on the inner surface thereof.
A piston rod 54 extending upward is formed at the bottom of the valve, and a valve 55 formed in the shape of a downwardly expanding trumpet is attached to the lower surface of the piston rod 54. Then, the piston 53 and the valve 5
A fluid transfer hole 56 penetrating these is formed in 5.

Further, the bottom plate 57 of the cylinder 52 is connected to a rotary hinge 59 via a connecting member 58, and the mounting plate 60 to which the hinge 59 is mounted is attached by bolts 61 to the base structure side of the lower structure, for example. -It is attached to G1. A connecting member 62 is formed at the tip of the piston rod 54, and the upper side of the fluid damper 51 is connected to the rotary hinge 63 via the connecting member 62, and the hinge 63 is attached. Mounting plate 64 is bolt 6
It is attached to, for example, the base plate 3 on the superstructure side by 5.

A cushion stopper 67 is attached to the lower surface of the upper plate 66 of the cylinder 52 to form a cushioning material when the piston 53 is maximally raised. The upper plate 66 and the cushion stopper 67 have a vent hole 68 penetrating them for adjusting the internal pressure of the cylinder.
Are formed. Furthermore, the upper plate 66 of the cylinder 52
An inner pressure adjusting expansion / contraction curtain 69 that adjusts the inner pressure of the cylinder 52 that covers the upper surface of the upper plate 66 is provided on the upper surface of the.

The system damper 51 as described above is installed between the lower structure and the upper structure of the rolling bearing system seismic isolation member according to the present invention to form a seismic isolation structure. Further, since a vertical load is applied to the seismic isolation structure by the building body, when a horizontal force is generated by an earthquake, the laminated rubbers 7, 7 ... Are horizontally displaced, and the damper 51 is rotated by the rotary hinge 59. With the fulcrum as a fulcrum, it inclines corresponding to the seismic energy in the direction in which the horizontal force is generated. In the process of this inclination, the piston rod 54 extends from the cylinder 52 and sequentially raises the piston 53 in the cylinder 52. As the piston 53 rises, the valve 55 also rises, and the piston 53 in the cylinder 52 rises. Fluid on top of the valve
From the outer periphery and the fluid movement hole 56 to the lower part of the piston 53 in the cylinder 52, and the ventilation hole 6
The air in the cylinder 52 is ejected from the No. 8 to the internal pressure adjusting expansion / contraction curtain 69, and the seismic energy is absorbed to some extent by the fluid system damper 51 while preventing an abnormal rise in the fluid pressure in the cylinder 52. To do.

In the process in which the horizontal force acts in the opposite direction due to the seismic vibration, the fluid system damper 51 tries to return to its original upright state with the rotary hinge 59 as the fulcrum due to the restoring force of the laminated rubbers 7, 7. To do. In the process of this return, the piston rod 54 is sequentially housed in the cylinder 52, and the piston 53 is sequentially lowered in the cylinder 52. As the piston 53 is lowered, the valve 55 is lowered while being expanded in diameter. The fluid in the lower part of the piston 53 inside flows out from the fluid moving hole 56 to the upper part of the piston 53 in the cylinder 52, and the air stored in the internal pressure adjusting expansion / contraction screen 69 flows from the vent hole 68. The seismic energy is strongly absorbed by the fluid damper 51 while flowing into the upper portion of the piston 53 in the cylinder 52 to prevent abnormal negative pressure of the fluid in the cylinder 52.

The damper 51 continues to absorb the seismic energy while repeating the process of moving the fluid between the upper and lower parts of the piston 53 of the fluid damper 51 a plurality of times. When the earthquake ends, the restoring force of the laminated rubbers 7, 7, ... causes the damper 51 to return to its original upright state with the rotary hinge 59 as a fulcrum.

However, the restoring force of the laminated rubbers 7, 7 ... Decreases as they approach the center of the seismic isolation structure, and the damper
The restoration speed of 51 decreases. However, eventually, with the lapse of time, the piston 53 is gradually lowered by the reduced restoring force of the laminated rubbers 7, 7 ... And the upper load to bring the damper 51 closer to the vertical direction and finally the damper 51.
To completely restore the original state.

Since the vertical moving speed of the piston 53 can be adjusted by the diameter of the fluid moving hole 56, the tilting of the damper 51 can be easily synchronized with the tilting of the laminated rubbers 7, 7. However, in particular, in the step of extending the piston rod 54 as the inclination of the fluid system damper 51 increases by forming the valve 55 of the fluid system damper 51 applied to the present invention in the shape of a downward expanding trumpet,
Even if the valve 55 is shrunk to facilitate the movement of fluid and the piston force is small, the damper 51 can be easily tilted. Further, in the process of contracting the piston rod 54, the valve 55 is expanded in diameter to increase the piston force in order to prevent the fluid from moving. Since the action of force exerted by the valve 55 is the inverse action of the deformation action force of the laminated rubbers 7, 7, ..., The fluid damper 51 absorbs seismic energy better and is more effective. It becomes possible to exert a damping action.

In addition, in order to use the fluid damper 51 together with the rolling bearing seismic isolation member, in the above embodiment, the fluid damper 51 is interposed between the upper and lower flange steel plates 4 and 2 of the rolling bearing seismic isolation member. Although the fluid damper 51 is attached between the lower structure and the upper structure, the fluid damper 51 is mounted on another member in the vicinity of the rolling bearing seismic isolation member. You may use together with.

[0041]

According to the present invention, the laminated rubber is erected between the upper and lower flange steel plates at the four outer corners of the rolling preventives of the steel balls formed on the upper and lower steel ball raceways, and the central end of each laminated rubber is The role of a trigger connected to a guide steel plate, a guide hole for holding the horizontal center position of the steel ball in the central part of the guide steel plate, and formed in the central part of each of the upper and lower steel ball bearing plates Since the steel ball is held by the position hole that fulfills the above and the guide hole, in the rolling bearing type seismic isolation member including each laminated rubber divided around the steel ball, the divided laminated rubber is used. While forming a small horizontal rigidity, the laminated rubbers and the steel balls cooperate with each other to sufficiently withstand the eccentric pressure even when a large horizontal deformation occurs during an earthquake.

Then, the rolling surfaces of the steel balls are arranged above and below to form a relatively small rolling surface so that the steel balls can be stably guided by the guide steel plate, and the damping is achieved by the cooperation with the laminated rubber around the steel balls. Since the restoring operation is performed, the rolling support system seismic isolation member has a safe operation and is compact.

When the steel balls are divided into an odd number of stages in series, steel balls having a relatively small diameter with respect to the distance between the steel ball bearing plates are adopted, and the rolling bearing system is not supported. The seismic member can be downsized, and it becomes a rolling bearing type seismic isolation member that can be easily applied to small-scale buildings.

The lower steel ball washer is on the lower structure side, the upper steel ball washer is on the upper structure side, the upper end of each laminated rubber is the upper flange steel plate, and the lower end of each laminated rubber is the lower flange steel plate. When the center end of the laminated rubber is joined to the guide steel plate by bolts, it is possible to assemble each of the above-mentioned members on-site and to disassemble and carry them for inspection and maintenance. It becomes a rolling bearing type seismic isolation member that can easily be used.

Also, a cylinder, a piston that slides on the inner surface of the cylinder, a valve formed in a trumpet shape on the lower surface of the piston, and a fluid moving hole that penetrates the piston and the valve. When a fluid damper including the and is installed between the lower structure side and the upper structure side, the valve of the fluid damper is formed in a downwardly expanding trumpet shape, so that in the process of extending the piston rod, The valve shrinks to facilitate the movement of the fluid to reduce the piston force, and in the process of contracting the piston rod, the valve is expanded in diameter to prevent the movement of the fluid and increase the piston force. And because the action phenomenon of force by this valve is the inverse action of the deformation action force of laminated rubber and the force, the fluid damper can absorb the seismic energy better and exert a more effective damping action. Becomes

[Brief description of drawings]

FIG. 1 is a plan layout view of a rolling bearing type seismic isolation member according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan layout view of another embodiment of the rolling bearing type seismic isolation member according to the present invention.

FIG. 4 is a sectional view taken along line BB of FIG.

5 is a cross-sectional view for explaining the operation of FIG.

FIG. 6 is a vertical cross-sectional view of a fluid damper used together with the rolling bearing seismic isolation member according to the present invention.

FIG. 7 is a sectional view of a conventional rolling bearing type seismic isolation member.

FIG. 8 is a cross-sectional view of another conventional rolling bearing seismic isolation member.

[Explanation of symbols]

2,4 flange steel plate 6,9 Steel ball bearing washer 7 laminated rubber 10, 30, 31, 32 steel balls 11,12 Steel ball rolling prevention 13 Guide steel plate 15 guide holes 16 and 17 position holes 41, 42, 43, 44, 45 Volts 51 Fluid damper 52 cylinders 53 pistons 55 valves 56 Fluid transfer hole

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) E04H 9/02 351 E04H 9/02 351 F16F 9/19 F16F 9/19 15/023 15/023 A

Claims (4)

[Claims] 1. A rolling bearing member is provided between the lower steel ball washer mounted on the lower structure side between the lower structure and the upper structure and each central portion of the upper steel ball washer mounted on the upper structure side. In a bearing-based seismic isolation member in which a certain steel ball is placed, laminated rubber is erected between the upper and lower flange steel plates at the four outer corners of the steel balls formed on the upper and lower steel ball raceways to prevent rolling. A central end of the rubber is connected to a guide steel plate, and a guide hole for holding the horizontal center position of the steel ball is formed at the center of the guide steel plate, and formed at the center of each of the upper and lower steel ball raceways. A rolling bearing type seismic isolation member, characterized in that a steel ball is held by a position hole which plays the role of a trigger and the guide hole. 2. The rolling bearing type seismic isolation member according to claim 1, wherein the steel balls are divided into odd series stages. 3. The lower flange steel plate to which the lower steel ball washer is connected is on the lower structure side, the upper flange steel plate to which the upper steel ball washer is connected is on the upper structure side, and the upper end of each laminated rubber is the upper flange steel plate. The lower end of each laminated rubber is joined to the lower flange steel plate, and the central end of each laminated rubber is joined to the guide steel plate by bolts, respectively. 4. A cylinder, a piston that slides on the inner surface of the cylinder, a valve that is formed on the lower surface of the piston in the shape of a downward flare, and a fluid movement hole that penetrates the piston and the valve. 2. A fluid system damper including, is provided between the lower structure side and the upper structure side.
Rolling bearing type seismic isolation member described.